Printing-telegraph



(No Model.)

- 2 Sheets-Sheet 1. G. B. SCOTT. PRINTING TELEGRAPH. 1 No. 365,705. Patented June 28, 1887.

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(No Model.) H 2 Sheets-Sheet 2 G. B. SCOTT.

PRINTING TELEGRAPH.

Noysesflogsf Patented June 28, 1887.

UNITED STATES PATENT OFFICE,

GEORGE B. soor'r, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE WESTER UNION TELEGRAPH COMPANY, OF NEW YORK,

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent. No. 365,705, dated June 28, 1887.

Application filed February 2*, 1887. Serial No. 229,132. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE E. SCOTT, of the city of Brooklyn, county of Kings, and State of New York, a citizen of the United 5 States of America, have made a new and use i'ul Im provcmentin Circuit-Break ers and Pole- Ghangcrs for Printing-Telegraph Transmitters, of which the following is a specification.

In printing-telegraph systems in which the i type-wheels are advanced step by step by short electrical impulses strong electrical currents are employed and the battery is rapidly placed to and removed from line, or where reversed impulses are used, instead of pulsations of the same polarity, the battery-poles are rapidly reversed.

The difficulty arising from the spark occurring upon the removal of the battery from circuit, or upon the removal of a positive pole from the circuit and substituting a negative battery-pole therefor, has heretofore been overcome by causing several interruptions to be simultaneously made along the circuit.

My invention consists in the employment of 2 improved apparatus for causing such simultaneous interruptions; and it further consists in the employment of a removable safety-plug through which the circuit is normally completed, and which consists of two metallic parts, which are joined by a tin-foil strip of such proportions that an abnormally strong current will fuse and destroy the tin-foil and disrupt the circuit.

Referring to the accompanying drawings 3 5 Figurel is a diagrammatic view representing a part of my invention when embodied in a polechanger of a printing-telegraph transmitter. Fig. 2 is a plan view of the top of my safetyplug, in which a fusible tin-foil strip is employed. Fig. 3 isa side view of said plug.

Fig. 4 represents a side view of an electromagnetic apparatus for controlling the polechanging apparatus shown in Fig. 1. Fig. 5 is a modification of apparatus shown in Fig. 5 1, in which the circuit is only broken at one point by the movement of a contact-lever, instead of at two points.

Referring to Fig. l, a b c d are contact-1evers, which are pivoted, respectively, at points ft 1 h, and each of said levers is provided with a retracting-spring, s.

r and s are fixed metallic anvils, and t is a separate stationary block of conducting material arranged in close proximity to anvil s, and is separated therefrom by the circular opening it, within which a removable safetyplug is inserted to complete the circuit. The

poles of the main battery M B are respect ively joined with anvil r and block i by means of wires 8 and 4. Levers a b c (l are respectively provided with contactsprings j m k l, which are adapted to be brought into contact with and removed from anvilsn q 0 upon the to and-fro movement of the vibrating arm A, Fig. 4, which carries the insulatinghead 6. By the movement of the insulating-head e to the position shown in Fig. 1 1e vers c 01 will have broken contact with the anvils r and s at points 12 and 13, and springs Ia and Zwill have been separated from anvils 0 7o andp, and at the same time the retractingsprings of levers a and b will have caused contact to be made between lever a and anvil r and between lever b and anvil s at points 10 and 11; also, contact-springsj and m'will have made contact with anvils n and q. Anvils n and p arejoined by the wire 2, while anvils 0 and q are joined by wire 5. Anvil n is connected by wire 1 to ground G, and anvil Q is in connection with the main line L. If, now, So the vibrating head 0 be moved to the other extreme position of vibration, levers c and at will be brought into contact with anvils r and s at points 12 and 13, while contact at points 10 and 11, between arms a and b and anvils r 8 5 and s, will be broken. Likewise, springs k and I will be brought in contact with anvils 0 and p, while springs j and on will be separated from anvils n and q.

The safety-plug for joining anvil s and block 0 twhen placed in the aperture 10 consists of two metallic pieces, 2 2, which are attached to an oblong guttapercha body, y, in the top of which is worked a cavity, into which supporting-wires '0 and 00 project. These sup- 5 porting-wires o and w are respectively joined to the metallic pieces a z, and are connected together by a fusible tin-foil strip, 20, or a strip of equivalent material, of such proportions as to be readily destroyed by an abnor- 10o mally strong current. Thus when said plug is inserted in the cavity a the circuit will be protected against any abnormally strong current which is sufficientlygreat to melt or fuse the strip 10. This arrangement I find of great convenience, since the fusible strip after being destroyed may be easily replaced in a removable plug, as the plug may be removed and taken to a repair-shop.

In Fig. 4 F is agutta-percha base, upon the top of which is arranged the pole-changing apparatus shown in Fig. 1. To thelower side of said base is connected a permanent magnet, M, with pole-pieces B and 0, between which the armature A vibrates. Armature A projects upward through an opening in the base F and carries the insulating-head c. The armature A is supported upon the pivot 1) and within the axial opening of electromagnet E. lhe coils of elcctro-magnet E are included in a local circuit, which is provided with any suitable circuitebreaker for operating the armature A and the pole-changing device shown in Fig. 1.

When thesal'ety- )lug is inserted in opening a, with the apparatus in the position shown in Fig. 1, the circuit from ground will be as follows: Wire 1, anvil a, springj, lever e, au vil 1', wire 3, battery M B, wire 4, connecting block I, the safety-plug, anvil s, lever I), spring on, and anvil g. It will now be seen that this circuit is closed at four points, and that it will be simultaneously broken at each and all of said points upon the movement of the vibrat ing head a.

In the second position of the vibrating head 0 the circuit from ground G to the line L will be as follows: IVire 1, anvil a, wire 2, anvil p, contact'spring Z, lever (7. anvil s, the safetyplug, block 1, wire 4:, battery M B, wire 3, anvil 1-, lever c, contact-spring In, anvil 0, wire 5, and anvil q. Following either movement of the vibrating head 0, therefore, the circuit will be simultaneously broken at four points.

If it were desired to merely open and close the main-line circuit and not to reverse the batterypoles of M B, either the two upper or the two lower levers might be dispensed with. For example, it the lovers 0 and it were removed, the circnit could be broken at four points upon bringing the vibrating head 6 in contact with the arms a and Z). By employ ing the two arms a and b, as has just been seen, the circuit would be broken at four points. It the lever b were dispensed with, the circuit would be broken at two pointsthat is to say, at points 10 and at the anvil 12.

Instead of employing two levers on each side of the vibrating head a, three or more levers might be used and the circuit broken at twice as many points as there are levers employed; also, as shown in Fig. 5, the anvils n 0 q and springs j m 75 Z may be dispensed with, and the circuit so modified as to cause each contact-lever to open and close the line at one point only, instead of at two points.

That I claim, and desire to secure by Letters Patent, is

1. In a printiugtelegraph transmitter, the combination of the vibrating arm 0, contact levers a b, anvils r 8, contact springs m, anvils, n I], retracting-springs 8. battery M B, ground wire 1, and main line L.

2. In a printing-telegraph transmitter, the combination of the vibrating arm 0, contactlevers a Z) 0 (Z, anvils r s n 0 p I[,I6i}1fl.0tlllgsprings 8', main battery M B, groundwvire 1, wires 2 and 5, and main line L, as and for the purpose described.

3. In a printiug-tclegraph transmitter, the combination of a main-line battery, M B, con tact-levers a b c (1, contacts a 0 q, anvils r s, and vibrating arm 0.

4:- A safetyplug For completing an electrical circuit, consisting of metallic pieces :15, forming the shank of the plug, a hollowedont head, y ,to which the shank-pieces are attached, conductors c 20, extending into said hollowed out space, and a strip, 15/, ot'tin-foil or other equivalent material arranged within said hollowed-out space in the head y and joining conductors c m, substantially as described.

GEO. B. SCOTT.

XVitnesses:

\VM. ARNOUX, JOHN G. SANDEns. 

